A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

Snapshot of Zoe Buttigieg murder case

* Bowe Evan Levi Maddigan, 31, father of two, of Mildura, who has a history of substance-fuelled violence

CHARGES

* Maddigan pleaded guilty to committing an indecent act on and murdering 11-year-old Zoe Louise Buttigieg in her bedroom in the early hours of October 25, 2015

ARREST

* Police picked up Maddigan walking barefoot along the Hume Freeway, dazed and with self-inflected injuries about 10km from Zoe's Wangaratta home at 6.30am on October 25 - hours before her mother found her lifeless body

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* After a night of drinking and smoking cannabis with Zoe's mother Janelle Saunders, her partner and others, Maddigan got the girl down from her bunk bed, sexually assaulted her, strangled her and then put her back in bed

* No explanation for the assault or murder has been given - other than Maddigan's sexual gratification - nor why a large gold ring belonging to him was found in Zoe's mouth

* Maddigan's defence lawyer appealed for a non-life sentence, saying he had prospects of drug and alcohol rehabilitation in prison, and had embraced Christianity

SENTENCE

* Life imprisonment, with a 28-year non-parole period

* "It is almost trite to say your offending was extremely serious. It might not have been a prolonged or frenzied attack ... But the fact you murdered her is gratuitous" - Justice Lex Lasry told Maddigan.